This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Drawing is defined less by any single material than by a way of building an image, mark by mark, with line doing most of the representational work. Encyclopaedia Britannica calls it, in formal terms, the primarily linear rendition of objects in the visible world, as well as of concepts, thoughts, attitudes, emotions and fantasies given visual form. Tate's shorter definition arrives at nearly the same place from a different direction, describing drawing as essentially a technique in which images are depicted on a surface by making lines, while allowing that washes, tone and other non-linear elements often extend a drawn image beyond pure line. The materials associated with drawing are comparatively direct and simple: dry media including charcoal, slate pencils, graphite points, metal styli, chalks and colored crayons, and wet media including diluted paint. The surface receiving these marks has historically been almost anything with a plane, from papyrus and parchment to cloth, wood, metal, ceramic, stone, walls, glass and sand, well before paper became the medium's default support. What separates drawing from its nearest neighbor, painting, is not simply the tool but the relationship between the artist's hand and the finished object. Painting builds an image chiefly through passages of color and mass; drawing builds it chiefly through the structural logic of line, reinforced, where an artist chooses, by techniques such as hatching, in which parallel strokes model the fall of light and the roundness of a form, and cross hatching, which deepens shadow through overlapping sets of lines. Drawing is further separated from prints and other reproduced graphic images because a direct relationship exists between production and result: a drawn line is the artist's own gesture, made once, without an intervening plate, block or mold, part of why drawing is often called the most personal of all artistic statements. That directness has let drawing serve two roles throughout its history, a private tool for an artist's own thinking and, since the Renaissance, a finished and collectible work of art in its own right.